Shoulder and neck pain

I have done way too much, and I am suffering for it.  I have been sitting too long at this computer, my back my shoulders my neck all scream in pain!  I have a headache I have had all day.  I cooked one dish today for 20 people, it took me four hours of standing at the stove, taking breaks, poping pain pills and still being in a lot of pain but finally getting it done.  I immediately went to my bed and laid there for four hours longer in terrible pain and being unable to sleep or get relief.  I am paying for my good deed.  The party this dish is for is tomorrow, my dad's 74th birthday and I dread being with all these people, although they are my family.  I love them, but I find it hard to do small talk and be social when I am hurting so.  The conversation eventually comes around to the Fibromyalgia I have.  What do I say, yeah I suffer daily and have to go on living anyway.  Yeah, I don't like my quality of life anymore, but hey look on the bright side, at least I can still make this awesome dish I brought.  Never mind I will probably be unable get out of bed for two or three days.  Yeah, I don't want to go.  I must talk myself into this or my hubby and kids will end up going without me.  Blah.  j